<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app"></div>
</body>
<script src="https://unpkg.com/vue@next"></script>
<script>
const app=Vue.createApp({
    template:`
    <common-demo />
    <async-common-demo />`,

})
app.component('common-demo',{
    template:`
    <div>hello Vue.js</div>`
})
app.component('async-common-demo',Vue.defineAsyncComponent(()=>{
    return new Promise((resolve,reject)=>{
        setTimeout(()=>{
            resolve({
                template:`
                <div>the id an async Component</div>`
            })
        },3000)
    })
})),
app.mount("#app")
</script>
</html>